Yellow PP → Natural PP

Colour Change & 1st Carbon Removal Procedure on 280 Tonnes Engel

The Process

BBU highlights yellow degradation

Screw and Barrel must be this
clean before moving to the hot runner

Increased hot runner tips by 20°C and moulded with Poly Clear HR20 till clean

Moulded Poly Clear HR20
Moulded natural PP with reduced tip temps


Normal Results:

  • Stop running masterbatch
  • Run PP natural parts
  • 3 hrs colour staining/ gate scars

Aquapurge Results:

  • 3 kg BBU (first carbon removal)
  • 3 kg Poly Clear HR20
  • 35 minutes

You can also read this Case Study here